EM4095 Datasheet, PDF (1/10 Pages) EM Microelectronic - MARIN SA – Read/Write analog front end for 125kHz RFID Basestation

EM MICROELECTRONIC - MARIN SA
EM4095
Read/Write analog front end for 125kHz RFID Basestation
Description
The EM4095 (previously named P4095) chip is a CMOS
integrated transceiver circuit intended for use in an RFID
basestation to perform the following functions:
- antenna driving with carrier frequency
- AM modulation of the field for writable transponder
- AM demodulation of the antenna signal modulation
induced by the transponder
communicate with a microprocessor via simple interface.
Features
Integrated PLL system to achieve self adaptive
carrier frequency to antenna resonant frequency
No external quartz required
100 to 150 kHz carrier frequency range
Direct antenna driving using bridge drivers
Data transmission by OOK (100% Amplitude
Modulation) using bridge driver
Typical Operating Configuration
Read Only Mode
L_A ^+5V
C_RES
C_DV1
+5V
C_DV2
RDY/CLK
1
2
16
15
C_DC2
C_FCAP
3
14
4 _EPM44009955 13
5
12
6
11
SHD
DEMOD_OUT
MOD
C_AGND
µP
7
10
C_DEC
8
9
Data transmission by Amplitude Modulation with
externally adjustable modulation index using single
ended driver
Multiple transponder protocol compatibility
(Ex: EM400X, EM4050, EM4150, EM4070, EM4170,
EM4069….)
Sleep mode 1µA
USB compatible power supply range
40 to +85°C temperature range
Small outline plastic package SO16
Applications
Car immobiliser
Hand held reader
Low cost reader
Pin Assignment
VSS
RDY/CLK
ANT1
DVDD
DVSS
ANT2
VDD
DEMOD_IN
SO16
DC2
FCAP
SHD
DEMOD_OUT
MOD
AGND
CDEC_IN
CDEC_OUT
Fig. 1
Read/Write Mode
L_A ^+5V
C_RES
C_DV1
+5V
C_DV2
RDY/CLK
1
2
16
15
C_DC2
C_FCAP
3
14
4 _EPM440095 13
5
12
6
11
SHD
DEMOD_OUT
MOD
C_AGND
µP
7
10
C_DEC
8
9
Fig. 3
Fig. 2
Copyright  2002, EM Microelectronic-Marin SA
1
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